Michael Sanford is accused of attempting to grab a police officer's gun after asking for the Republican candidate's autograph on June 18

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In this June 18, 2016, photo, police remove Michael Sandford as Republican presidential candidate Donald Trump speaks at the Treasure Island hotel and casino in Las Vegas. Sandford, a British man accused of trying to take a police officer's gun and kill the presumptive Republican presidential nominee pleaded not guilty to the charges in federal court on July 6, 2016.

The mother of a British man accused of trying to assassinate Donald Trump at a Las Vegas casino said her son had "a lifetime of mental health problems" and was on suicide watch in a Nevada jail, NBC News reported.

Lynne Sandford said her son, 20-year-old Michael Sandford, has autism and Asperger's syndrome and watches children's cartoons. She said her son would not have understood the consequences of his actions.

Michael Sanford is accused of attempting to grab a police officer's gun after asking for the Republican candidate's autograph on June 18. He faces charges of disrupting government business and being an illegal alien in possession of a gun. His U.K. lawyer argues he is unfit to enter a plea.

Lynne Sandford said she feared her son would die inside a U.S. prison.

Trump Booed Leaving New York Times

President Elect Donald Trump is booed as he walks through the lobby of The New York Times Building after a 75-minute meeting with Times journalists. The lobby of the Times building is open to the public, and a large crowd had gathered by the time he departed. (Published Tuesday, Nov. 22, 2016)

"He is extremely vulnerable and would not survive," she said. "We want to try to bring him home from the U.S. to a secure place that will help him."